计算重复值PHP

<?php
function countDuplicates($arr) {
    $count = array();
    foreach ($arr as $value) {
        if (isset($count[$value])) {
            $count[$value]++;
        } else {
            $count[$value] = 1;
        }
    }
    $duplicates = array();
    foreach ($count as $key => $value) {
        if ($value > 1) {
            $duplicates[$key] = $value;
        }
    }
    return $duplicates;
}

$data = array(1, 2, 3, 4, 2, 3, 4, 5, 6, 6, 7);
$duplicates = countDuplicates($data);

echo "重复值及其出现次数：\n";
foreach ($duplicates as $key => $value) {
    echo "值 $key 出现了 $value 次\n";
}
?>